For years I've used Redline's SI-1 "Fuel Injector & Valve Cleaner." It's the only injector cleaner officially endorsed by a little-known German automaker -- BMW.
When I had my injectors out last summer (for a complete intake/fuel system gasket rebuild project), the tips of the injectors were amazingly spotless.
The gas mileage in my 96SE MTX remains at a steady 25MPG City and 31-34 MPG Highway (oddly, with 33-34 MPG occurring only when I have the A/C on).
I bought a case of SI-1 three years ago and have never regretted it!
